Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb802d624f0d133…

MALICIOUS

PDF

31.6 KB Created: 2020-08-13 18:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eb4e889a2ac49926cba02de831639a6 SHA-1: 0b1809912849945d215075669f1a5f3994170e55 SHA-256: 5fb802d624f0d133cd152cac98c7eb7e8e8f4fbd3d2ddff57278d15dd0cbf4ec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a malicious redirector, likely intended to lead the user to a phishing or malware download site. The presence of numerous external PDF links further suggests a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=expansores%20de%20plasma%20pdf
    • http://dupepo.remedycentralcoast.com/uploads/1/3/2/8/132814930/sexeba.pdf
    • http://kukuraw.peservicesmn.com/uploads/1/3/1/4/131453050/kudebux.pdf
    • http://files.willow-clothingco.com/uploads/1/3/2/7/132710628/c74fa3538ed28.pdf
    • http://files.justjule.com/uploads/1/3/1/1/131164052/xolixijozukurenez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/86521082386.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/vapudilasak.pdf
    • https://cdn.shopify.com/s/files/1/0449/4747/2552/files/asthma_medications_chart.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/majegosonibemigegaziseron.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/jagavela.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/pixanedimezunekesireti.pdf
    • https://cdn.shopify.com/s/files/1/0428/7964/7900/files/fusimujirigeresane.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/grade_12_biology_textbook_mcgraw_hill.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/8839809509.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/14717241073.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/cauchy_euler_equation_examples.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041a5.bin
148c334a3bae88ec04ff4f3f3e4868b340f0bbcbee4e50d35630b2ea23c2f78f
pdf-font-stream PDF embedded font (sfnt) at offset 0x41A5 5212 bytes
font_01_sfnt_off00005347.bin
17da5f4fb3faefd03be8d7280bac1ffa584be131c20104e8c966cc5aa0fccb54
pdf-font-stream PDF embedded font (sfnt) at offset 0x5347 9240 bytes